The remote adjustment of the sieve and chaffer will not help improve performance a whole lot if you can not really tell WHAT is in the tailings also. If there is a chaff over load, more air blast would be more appropriate. If the overload is due to too much grain, a wider lower sieve setting is needed. If the returns represent a high level of underthreshed crop, then the concave should be set a little tighter, or a fast rotor speed is needed.